Casco Bay Diesel

Casco Bay Diesel opened in Portland, Maine in 1994 with the intent of providing the best diesel engine powertrain service to be found in the Northeast. While that may be a tall order, we've found that good customer service is severely lacking in our area. With 40 years of experience working on diesel engines, the last 20 years primarily on marine, we have found what works and what doesn’t.

Although we are authorized dealers for Mitsubishi®, ZF®, Yanmar®, MAN® and Isuzu®, a large portion of our work has been on Caterpillar®, Cummins®, and Detroit Diesel® powered equipment. MAN® high performance engines have become very popular in modern yachts, and we have provided service from Lunenburg, Nova Scotia to Miami Beach, Florida. Our valued customers trust us, and call us from all over the eastern seaboard when they have problems because they know that somehow we will get them going.

Transmissions is another area of expertise that we provide, not only for fishing boats and yachts, but also for construction equipment. Many times we have had to build special tools that are just not available in this area, in order to get the job completed.

Recently, we have purchased electronic diagnostic equipment in order to keep up with the ever changing diesel engines. It’s almost impossible now to buy an engine that is not controlled by a computer. With more and more engines being built with what is called “common rail” fuel injection, diagnosis by computer is essential.

Casco Bay Diesel provides on-site service for generators, heavy equipment, trucks, and marine vessels. We can even re-power your vessel, regardless of its size. Check out a couple of our recent repowers in that section. As a certified marine analyst, the owner, Bob Chamberlain, knows what’s required to properly install and maintain an engine in order to provide peace of mind to the vessel’s owner.

When it comes to rebuilding your existing engine, we use only genuine OEM parts or IPD® parts. IPD has committed itself to providing the best Caterpillar engine replacement parts money can buy, at a price more affordable to the consumer. Their warranty is the best in the business, so we use them whenever our customers permit it. There are a lot of copycat parts out there at a cheap price, but “you get what you pay for”. Engines that are rebuilt in our shop are run and tested, and checked for leaks. Soon, we will have the equipment to run and test transmissions as well. That way, when you install your newly built machinery, you are assured of turnkey operation.

If you have questions regarding a rebuild, repair, or re-power, feel free to call Bob or Galen, or email us at